ok could be this, please try the suggested workaround below
An update is stuck with a state of Downloading in the Updates and Servicing node of the Configuration Manager consoleDuring the automatic download of updates by an on-line service connection point, an update can become stuck with a stat of Downloading. When the download of an update is stuck, entries similar to the following appear in the indicated log files:
DMPdownloader log:
ERROR: Failed to download redist for 037cd17e-4d7b-40e1-802b-14bb682364c7 with command /RedistUrl http://go.microsoft.com/fwlink/?LinkID=724436 /LnManifestUrl http://go.microsoft.com/fwlink/?LinkID=724434 /RedistVersion 112015 /NoUI "D:\ConfigMgr\EasySetupPayload\037cd17e-4d7b-40e1-802b-14bb682364c7\redist"
ConfigMgrSetup.log:
Error: failed to verify 'd:\ConfigMgr\EasySetupPayload\037cd17e-4d7b-40e1-802b-14bb682364c7\redist\sqlncli.msi' authenticode signature.
Error: file signature check failed for 'd:\ConfigMgr\EasySetupPayload\037cd17e-4d7b-40e1-802b-14bb682364c7\redist\sqlncli.msi
Workaround: On the site server, modify the following registry key to match the following, and then either restart the SMS_Executive service, or wait up to 24 hours for the next automatic download cycle.
Key to edit: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing
Value for State: Set to 146944 Decimal or 0x00023e00 Hexadecimal